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@ 2014-07-09T01:11:26Z

<?php

$im = imagecreate(1,1);
foreach (range(0,255) as $r) {
    foreach (range(0,255) as $g) {
        foreach (range(0,255) as $b) {
            $c = imagecolorallocate($im,$r,$g,$b);
            if (-1 == $c) {
                var_dump($r, $g, $b);
            }
        }
    }
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
range: documentation ( source)

preferences:dark modelive preview

39.1 ms | 402 KiB | 5 Q